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Changes
This is a fix for a regression I introduced in #1804, which I happened to notice while working on something completely different.
Context
On the sidebar of the ProGit book and its translations, there is a link to the repository, to direct eager contributors to the place where they can contribute their changes.
However, I only seem to have tested this with the front pages of the various translations, as the link is bogus on every other page of the book.
An example can be seen e.g. here: https://git-scm.com/book/en/v2/Getting-Started-About-Version-Control. The link "The source of this book is hosted on GitHub." points to itself.
This PR fixes that. Demo: https://dscho.github.io/git-scm.com/book/en/v2/Getting-Started-About-Version-Control (where I branch-deployed this fix).